Ilmi_03..., it is good to see you again here with a very good report writing. However, some changes are needed in particular the opening statement. Here it comes:
The maps compares the differences of a school building, West Park Secondary School, from 1950 to 2010. Overall, it can be seen that, the building experienced a significant change a six-decade period.
The development of West Park Secondary School is illustrated in the maps. A significant alteration from 1950 to 2010 was seen in optimization for the schools' various needs. Some public areas for the past 60 years had no changes.
A good paragraph is written at least with three sentences. As you can see, I utterly develop my opening paragraph with that structure.
the school has been improving its facilities continuously
The grammar is correct, but the meaning is illogical. To tackle this, swap the sentence into a passive form. Schools' facilities had been improved massively.
Hope this helps :D
A heap of luck